The self-employed lawyer's car: what can be deducted in income tax and VAT, and where the limit lies

A self-employed lawyer uses the car to go to court, to registries, to notaries and to client meetings. Intuition says that expense should be deductible "because it is for work". The law, however, treats the vehicle as a mixed-use asset by nature and applies the strictest regime in the whole catalogue of deductible expenses. Understanding where the limit lies saves trouble in the form of tax inspections.

In personal income tax: exclusive use as the entry barrier

Under Law 35/2006, assets assigned to the activity must be exclusively assigned when it comes to passenger cars, with hard rules of evidence: the Administration presumes that a car is used interchangeably for personal and professional purposes unless proven otherwise. In practice, the Tax Agency only accepts as assigned vehicles in specific categories (mixed goods-transport vehicles, driving schools, taxis, commercial agents, security services and similar) and leaves everyone else in a very demanding evidentiary position.

For a lawyer, that means that deducting depreciation, fuel, insurance or repairs on their own car in income tax is the exception, not the rule: they would have to prove the vehicle is never used for personal purposes, something almost impossible to sustain with a single car and no fleet. The sector's mainstream route is different: deducting real travel by other means, or bearing the vehicle cost as a personal expense, as we explained in per diems and mileage for the self-employed lawyer.

In VAT: the 50% rule and its exceptions

VAT is more generous in appearance. Articles 93 to 95 of Law 37/1992 establish a presumption: passenger cars are presumed to be assigned to the business or professional activity at 50%, which allows deducting half of the input VAT on the purchase and on running costs (fuel, repairs, tolls). And they presume 100% assignment for closed categories, including vehicles of commercial agents and representatives, taxis, driving schools, passenger transport and surveillance.

A solo law firm fits none of those categories, so the realistic ceiling is 50%. That said, the presumption does not waive proof of assignment. The Tax Agency can require the vehicle to appear in the record books, that expenses are supported by full invoices, and that professional use is credible. If the professional works from home and never visits clients, deducting 50% of the VAT on a high-end car is an invitation to an inspection.

What evidence to keep in order

• Full invoices (with the owner's tax ID) for fuel, workshops, insurance and the purchase; simplified receipts do not give the right to deduct VAT.
• Coherent records: the vehicle entered in the investment goods register if its acquisition is deducted, and in any case in the expense accounts, as part of the discipline we reviewed in the self-employed lawyer's record books.
• Means of justifying professional use: visit schedules, filings at courthouses, court car parks. In an inspection, coherence between real activity and declared expense is what decides.
• Coherence between taxes: deducting 50% of VAT while declaring no vehicle expense in income tax is defensible (they are different regimes), but it is worth being able to explain it.

Practical alternatives that do work

Since one's own car is barely deductible, self-employed professionals use parallel routes: deducting public transport, taxis and chauffeured hire cars for professional travel, deducting renting or leasing when the vehicle is fully and demonstrably assigned, or re-invoicing travel to the client as disbursements where appropriate, following the criterion we developed in disbursements on the lawyer's invoice.

Frequent mistakes to avoid

1. Deducting the loan instalments on the family car in income tax "because I also use it for work": without provable exclusive assignment, it does not stand.
2. Deducting 100% of VAT by invoking professional status: the 100% presumption is a closed list and lawyers are not on it.
3. Deducting fuel with receipts instead of invoices: VAT on simplified receipts is not deductible.
4. Recording nothing in the books: without traceability, any deduction is fragile.

The full framework of deductible expenses, with the correlation and proportionality rules, is in the guide to simplified direct estimation and deductible expenses, and the quarterly mechanics of the tax, in VAT for the self-employed lawyer and form 303.